# std::chrono::hh_mm_ss

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< cpp‎ | chrono

Defined in header `<chrono>` |  |
template< class Duration > class hh_mm_ss; |  | (since C++20)

The class template `hh_mm_ss` splits a std::chrono::duration into a "broken down" time such as hours:minutes:seconds, with the precision of the split determined by the `Duration` template parameter. It is primarily a formatting tool.

`Duration` must be a specialization of std::chrono::duration, otherwise the program is ill-formed.

### Member constants

constexpr unsigned fractional_width [static] | the smallest possible integer in the range `[`​0​`,` 18`]` such that `precision` (see below) will exactly represent the value of Duration{1}, or 6 if there's no such integer (public static member constant)

### Member types

Member type | Definition
`precision` | std::chrono::duration<std::common_type_t<Duration::rep, std::chrono::seconds::rep>, std::ratio<1, 10 `fractional_width`>>

### Member functions

(constructor) | constructs a `hh_mm_ss` (public member function)
is_negativehoursminutessecondssubseconds | obtains components of the broken-down time (public member function)
operator precisionto_duration | obtains the stored std::chrono::duration (public member function)

### Non-member functions

operator<< (C++20) | outputs a `hh_mm_ss` into a stream (function template)

### Helper classes

std::formatter<std::chrono::hh_mm_ss> (C++20) | formatting support for `hh_mm_ss` (class template specialization)

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